.Trans. Roy. Sac. 8. Australia, ix, p. 125') -ives priority in 

 "Philippi in Ze'dsehrifl fur Mnlnk., n. ( .<s." The species \\a< u 

 published in tlie Zeitschrij'f. 



The operculum is unknown to me; the. specie^ may p.-rhap> be 

 found to group elsewhere. 



Subgenus MAKMOKOSTOMA Swainson, is ID. 



Shell depressed-turbinete, very solid, deeply and widely umbili- 

 cate (exce})t in T. coronatus), smooth, lirate or nodulo>e: spin- 

 depressed, of few whorls; aperture round, produced hut m.t chan- 

 nelled at base. Operculum circular, nucleus subeentral, outside 

 convex, smooth or granulose. 



Australo- 



T. PORPHYRITKS ^lartyn, 1784. PI. 50, fig. 58. 



Shell depressed-turbinate, solid, umbilicate, greenish or hhu-ki-h. 

 irregularly inarked with rnaculations and angular patches or with 

 spiral bands of white and dark; spire depressed, obtuse; whorls .">. 

 the upper ones frequently carinate; suture subcanaliculatc. or often 

 scarcely at all impressed, sometimes bordered below by a <cv\< 

 obsolescent undulations; upper whorls spirally striate or granulate, 

 the sculpture becoming obsolete on last whorl but somet inn-- 

 appearing around the base; last whorl somewhat descending, large; 

 aperture oval, angulate above and below, white and iridescent 

 within, frequently margined with greenish; parietal wall frequently 

 excavated or callous; broad, somewhat flattened below the deep 

 narrow umbilicus, dilated and produced or rostrate at base. 



Alt. 35, diam. 40 mill. 

 Indian 0.; Philippines; New Caledonia; Solomon Is.; Australia, etc. 



Operculum (pi. 60, fig. 49) inside flat, with five whorls and sub- 

 central nucleus; outside very convex, white, the outer part green. 

 obsoletely granulose, nearly smooth. 



This is T. versicolor, mespilm, ludu* and porplujrili'* Gmel. T. 

 Iwjubris Kiener (PL 50, fig. 57). T. versicolor Kve. (pi. 42, fig. 39,) 

 is somewhat intermediate between porpliyrites audporcafn*. 



T. mespilus is said by Fischer to be thinner, more uniform in 

 color, more rostrate at base, last whorl more descending; but all tin- 

 characters are so variable that I cannot draw the line between the 

 several forms. 



